Pantograph-balancing mechanism for embroidering-machines.



. W. A. STELLMAOHER. PANTOGRAPH BALANCING MECHANISM FOR EMBROIDERING MACHINES.

APPLICATION FILED JUNE 11, 1912. 1,068,284.

Patented July 22, 19.13.

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W. vA. STELLMAGHER.

PANTOGBAPH BALANGING MECHANISM FOR EMBRQIDERING "MACHINES.

APPLICATION FILED JUNE ll 1912.

Patented July 22, 1913.

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W. A. STELLMAGHBE.

PANTOGRAPH BALANCING MECHANISM FOB. EMBROIDERING MACHINES.

APPLICATION FILED JUNE 11, 1912.

1,068,284, Patented July 22, 1913.

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WILHELIVL ALBERT STELLMAGHER, OF ARBON, SWITZERLAND.

PANTOGRAPH-BALANCING MECHANISM FOR EMBBOIDERING-MACHINES.

Specification of Letters Patent.

Patented July 22, 1913.

Application filed June 11, 1912. Serial No. 703,049.

To all w/m m, it may concern:

Be it known that I, /VILnnLM ALBERT S'rnnmmoi-rnn, a citizen of the Republic of lm irovements in Panto ra Jll Balancing '3 g1 Mechanism for Embroidering Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form apart of this specification.

The object of my present invention is a mechanism for balancing pantographs of embroidery machines by the force of a spring, in which there is provided at least one curved disk acted on by the spring, which disk transmits the action of the spring to the pantograph and is so formed, that at the movement of the pantograph the radius of the curved disk, which at any time acts as a lever transmitting'the force of the springto the pautograph is altered in order to balance the action of the weight of the pantograph at every position of the latter.

Preferably two disks or snail-like cams are used, one of which, by its varying leverage, compensates the variation of pressure and the other of which compensates the variable effective leverage of the pantograph.

In the accompanying drawing several constructions according to my present invention are illustrated by way of example.

Figure 1 is a side elevation which shows an embroidery machine carrying a mechanism for balancing the pantograph. Fig. 2 is a side elevation, showing the balancing mechanism on a larger scale. Fig. 3 is a front elevation of the same. Fig. 1 illustrates a second form of construction. Figs.

5 to 7 show different views of a third form of construction. Figs. 8 and 9 show variations of details of the second and third form of construction. Figs. 10 and 11 show different views of a further form of construction. Fig. 12 illustrates a last form of construction.

Referring lirstly to Figs. 1 to 3, 1 designates the frame of the embroidery machine on the top of which is mounted a support 2 having upward projecting arms 3 and 1. An axle 5 secured to the arm 3 pivotally carries a curved disk 6. A band 8 is guided on the surface of the latter and secured to it at 7 The other end of the hand is secured to a member of the pantograph 9 of the en'ibroidery machine. A helical tor sion spring 10 is secured by its one end to the curved disk 6 and by itsother end to a worm wheel 11. The worm wheel is mounted to turn about an axle 12, which is secured to the arm l: located co-axially with the axle 5. The worm wheel 11 meshes with a worm 13 mounted on the arm 41:, which worm can be turned by means of a square 14: provided on its axle.

The curved disk 6 is so formed, that when the pantograph is raised or lowered the radii of the disk are altered so with regard to the alteration of the tension of spring 10, that at every position of the pantograph the action of its weight is balanced. By means of the worm. gear 11, 13 the tension of the spring may be adjusted.

in the second form of construction (Fig. 4:) a concentric disk 16 to which is secured a curved disk 17 is mounted to turn about an axle 15 secured to the support 2. A band 18 guided on the surface of the disk is is secured by one end to the latter and by the other end to a member of the pantograph 9. A band 19 guided on the surface of the disk 17 is secured by one end to the latter and by the other end to a helical draw spring 20. The latter is connected to the machine frame by means of a threaded bolt 22 adjustably secured to the arm projecting from the support 2.

The curve of disk 17 is formed so that the radius of the latter which at any time acts as the lever transmitting the action of the spring 20 to the pantograph 9 is altered according to the alte "ation of the tension of the spring so that the action of the weight of the pantog 'aph is balanced at every position of the latter.

in the third form of construction (Figs. 5 to 7) the pantograph is mounted to turn about the axle 15. The curved disk 17 mounted on this axle provided with an arm 23 which by its free end supports a member of the pantograph 9. Below the axle 15 a curved disk 26 is mounted on a shaft 25 which is carried by two supports 24 secured on the frame 1. The worm wheel 27 of the worm drive 27, 28 is mounted to turn free about the shaft 25. By the worm drive the tension of the spring 29 may be acjusted. The helical spring 29 arranged between the worm wheel 27 and the curved disk 26 is secured by one end to the worm wheel and by the other end to the curved disk. A drawing member 30 passing over the surfaces of the curved disks 17 and 26 is secured by its ends to the disks.

The curves of the disks 17 and 26 are formed so that when the height of the pantograph is changed the radii of one of the curves increase while the radii of the other curve decrease in such a manner, that when the pantograph is moving downward the an gular motion of the curved disk 26 secured to the helical spring 29 is retarded with regard to the angular motion of the curved disk connected to the pantograph, which retardation in connection with the alteration of the radii balances the action of the weight of the pantograph in all its positions.

In the form of construction according to Fig. 8 the worm gear for stretching the helical spring 29 is replaced by a drawing member 31 passing over the surface of a concentric disk 35 mounted to turn free about the shaft 25. The drawing member, which is secured by its one end to the disk 85 and by its other end to a threaded bolt 32 passing through a projection 34: of the frame 1, can be adjusted by means of nuts 33.

The form of construction shown in Fig. 9 is distinguished from Fig. 4, in that the spring 20 and drawing member 19 act on the 7 disk 16 instead of on the cam-shaped member 17, as in Fig. 1, and the drawing member 18 has one end connected to a pantograph element and its opposite end con nected to the curved disk 17, instead of to the disk 16, as in Fig. 4.

In the form of construction according to Figs. 10 and 11 the axle 15 is free to turn in the support 2. The curved disk 17 and a member 9 of the pantograph 9 are secured to the axle. In this form of construction the axle 15 and the shaft 25 are mounted on the same level. The form of the curves of disks 17 and 26 is so, that the same effect is produced as in the form of construction according to Figs. 5 to 7.

In the form of construction shown in Fig. 12 curved disks 6 and 6 are secured on the axle 5 which is pivotally mounted in the support 2. The disk 6 is connected by a drawing member 8 to the member 9 of the pantograph, while the disk 6 is connected by the drawing member 19 to the spring 20.

I claim:

1. In mechanism for spring balancing the pantographs of embroidery machines, the combination with the pantograph, of a spring, and means for supporting the pantograph and acted upon by the spring to compensate for the varying strength of the spring for all difierent positions of the pantograph and for also compensating for the variation of the effective lever arm of the pantograph for all the various positions of the latter whereby the power required to move the pantograph remains the same under all conditions of operation.

2. In mechanism for spring balancing the pantographs of embroidery machines, the combination with the pantograph; of a spring, means connected to the spring to equalize its action for various positions of the pantograph, and means connected to the aforesaid means and acting on the pantograph to equalize the effective leverage of the pantograph.

8. In mechanism for spring balancing the pantograph of embroidery machines, the combination with the pantograph; of a curved disk for supporting the pantograph whose effective lever arm varies in accordance with the variations of the effective leverage of the pantograph, a second curved disk, a flexible connection between the two curved disks, a. spring acting on the second curved disk, the effective lever arm of said second curved disk varying to compensate the variation of the strength of the spring for the different positions of the pantograph.

4. In mechanism for spring balancing the pantographs of embroidering machines, the combination with the pantograph; of a curved disk having an arm engaging the pantograph, a second curved disk, at flexible connection between the curved disks, and a spring acting on the second curved disk.

5. In mechanism for spring-balancing the pantographs of embroidering machines, the combination with the pantograph; of a curved disk connected to the pantograph whose effective leverage compensates the variation of leverage of the pantograph, a second curved disk, a torsion spring connected to the second disk, said second disk connected to the first disk for compensating the variation of the spring for different positions of the pantograph, and means to adjust the tension of said spring.

6. In mechanism for spring-balancing the pantograph of embroidering machines; the combination with the pantograph; of a curved disk for supporting the pantograph, a second curved disk, a flexible connection between the disks, a worm wheel, a torsion spring between said wheel and second disk and a worm for turning the wheel.

7. In mechanism for spring-balancing the pantograph of embroidering machines, the combination. with the pantograph and its pivot; of a curved disk on said pivot and having a lateral projection on Which the my invention, I have signed my name in pantograph rests, a second curved dISk presence of two subscribing Witnesses. Whose axis is substantially in a horizontal 1 plane with said pivot, a flexible connection WILHEIM ALBER'L SKELLMAOHLR' between the disks, and a torsion spring eon- Witnesses:

nected to the second disk. R. SIGRIsT,

In testnnony that I chum the fo-regolng as EUGENE NABELN.

Copies of this patent may be obtained for flve cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

